Technical Debt: Investigate `emitter.js`

[gibbiemonster]

Investigate emitter.js. It appears to be for the easy registering/de-registering/emitting of events, but is this required anymore if we target modern JS?

Acceptance Critera

• Evaluate current functionality of emitter.js and where it is used in the framework.
  • Why does it (appear) to be used?
• If it is required, design a refactoring to bring it up to modern JS standards.
• If it is not required, design a solution to remove it from the framework and use native JS features instead.